Apparatus for filling bags

Abstract

The present invention relates to an apparatus for filling bags with a material and for sealing them, and it can carry the bags in a direction of a bag thickness. A first feature of the present invention resides in that, in the case that the bags are arranged between a pair of chain conveyors disposed in parallel vertical planes, they are gripped by plural pairs of grippers mounted on a pair of axes extending through each rectangular parallelepiped carrier. Further, a second feature of the present invention is that the apparatus according to the present invention is equipped with nozzles for introducing a compressed gas into the bags and pressure gauges for measuring a pressure within the bags in order to detect whether or not each bag is normally gripped by the grippers. Furthermore, another feature of the present invention is that a return pipe is fixed to a filling device so that the filling material may be returned to a storage tank, without being discharged therethrough, by closing the filling nozzle. Still another feature of the present invention is that seal bars for sealing the bags are covered with a heat-resistant cloth, and the cloth is sent out in turn to maintain uniform sealing conditions.

What is claimed is: 
     
       1. An apparatus for filling bags with a material and for sealing them, characterized by comprising: a pair of chain conveyors disposed in parallel vertical planes;   grippers for bags held on said chain conveyors;   nozzles for sealing openings of said bags gripped by said grippers and for introducing compressed air thereinto;   a pressure detecting device for measuring the pressure within said bags;   filling devices for filling said bags with the material; and   control means for receiving an output from said pressure detecting device and for controlling said filling devices thereby.   
     
     
       2. In a bag-filling apparatus a pair of chain conveyors capable of transporting bags in the direction of their thickness, gripper means supported in such a manner as can be moved at right angles to the direction of running of said chain conveyors and adapted to grip both the edges of the bag, and guide rails adapted to control the movement of said gripper means, the improvement which comprises a plurality of carriers supported between said chain conveyors, each of said carriers being provided with a pair of rods so supported as to slide at right angles to the direction of transportation of the bags, said gripper means being attached to each of said rods so as to move said rods in the axial direction by means of said guide rails; nozzles adapted to close the opening of the bag supported by said gripper means and to conduct pressurized air into the bag, a pressure detecting device for measuring the pressure producing an output signal in the bag, a filling device for filling material into the bag and control means for controlling said filling device upon receiving the output signal of said pressure detecting device connected to said pressure detecting device and said filling device.